Unable to insert record in db Mapping table with relationship many to one table in one go

As above table having many to one relationship we can see as arrow, we are considering Mapping table as master table, All tables we have created Record type.

1. in one UI page used "Mapping table", and in that page we are selecting Country, Region and Category code. Entering textbox values of "Info table" and "Att table"

and clicking "Submit" button. We are getting error.

"function a!dropdownField [line 33]: An error occurred while executing a save: Expression evaluation error: Field with [identifier=9b2cef30-2e3c-4575-9e32-c9897a6dff7a] not found on the Record Type"

2. Here we need to insert same record in "Info table" and "Att table" once done then new both Ids need to insert in "Mapping table" how we can do in one go on click of submit button?

"The input "Records" cannot be created or updated. The relationship configuration between "Mapping table" and "Att table" is set to 'Do not allow updates'. Location of the error: " Mapping[1].Att table"

Please help me here to rectify this problem."